Gobot1234 <gobot123...@gmail.com> added the comment:

I also support this change. I've had to write a lot of code to make 
SpecialForms able to accept my types where the code has to look like:
```py
class Something:
    ...
    def __call__(self, *args, **kwargs):
       raise NotImplementedError
```
I also know this comes up in typing-extensions a fair bit. I think type 
checkers should be enforcing this at type-checking-time not by typing.py 
run-time.

----------
nosy: +Gobot1234

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<https://bugs.python.org/issue46644>
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